Concrete-mixer.



A. R. HANNAPORD.

CONCRETE MIXER.

APPLICATION FILED Nov. 26, 1907.

Patented 0011.20, 1908.

flotn A'NSON RILEY HANNAFORD, OF TRAVERSE CITY, MICHIGAN.

CONCRETE-NBER.

Specification of Letters Patent.

Patented Oct. 20, 1908.

Application led November 26, 1967. Serial No. 403,926.

p To all whom it may concern.'

'Traverse and State of Michigan, have invented new and useful Improvements `in Concrete-Mixers, of which the following is a specification.

This invention relates to concrete mixers of the revolving drum type; and it has for its object to simplify and improve the construct-ion and operation of this class of devices, and to provide an improved concrete mixer having a water tankconnected therewith and equipped with means for conveying the water from said tank to the interior of the mixer, and sprinkling it over the mixture of cement and sand or gravel contained therein, so as to form plastic compound of the desired consistency.

With these and other ends in view which will readily appear as the nature of the invention is better understood, the same consists in the improved construction and novel arrangement and combination of parts which will be hereinafter fully described and particularly pointed out in the claims.

In the accompanying drawing has been illustrated a simple and preferred form of the invention; it being, however, understood that no limitation is necessarily made to the precise structural details therein exhibited, but that changes, alterations and modications within the scope of the invention may be resorted to when desired.

In the drawing, Figure 1 is a side elevation of a concrete mixer constructed in accordance with the invention. Fig. 2 is a longitudinal vertical sectional view. Fig. 3 is a vert-ical transverse sectional View taken axially through the drum of the mixer. i Corresponding parts in the several figures are denoted by like characters of reference.

rlhe drum 1 which may-be constructed of wood, metal, or other suitable material, is mounted for rotation upon a tubular shaft 2, the ends of which are supported in boxes or bearings near the rear ends of the thills 3; said bearings being provided with movable lids consisting of turn buttons lwhich enable the bearings to be readily disconnected from the tubular shaft, forconvenience in turning or reversing the machine in cramped quarters. The drum is provided with a removable lid 5 capable of beingsecured in position by fastenings such as hooks 6. The

drum is provided with a plurality of longitudinally disposed inclined cleats 7 upon its inner side for the purpose of assisting in elevating the contents as the drum revolves, to assist in agitating and thoroughly mixing the same.

Suitably supported by means of braces 8, which are connected with the thills and with a cross-bar 9 connecting the latter, is a tank 10 having an inlet aperture 11 for which a suitable lid or cover 12 is provided; this tank is supported above the drum, and itmay be utilized as a seat for the driver. A pipe 13 having a valve M-connects the tank 10 with the tubular shaft 2; and the latter is provided with apertures 15 through which water may be sprinkled over the contents of the drum, the water supply being regulated by the valve 111. i

Suitably supported upon the tubular shaft 2 adjacent to the ends or heads of the drum are collars 1G, preferably provided with set screws 17 whereby they may be secured in position; said collars being provided with radial arms 18. 19 designates a scraper extending longitudinally through the drum, the interior surface of which is engaged by said scraper; the latter is supported upon brackets 20 having sockets 21 slidably engaging the arms 18, which latter are pro` vided with springs 22 whereby the scraper supporting brackets are forced in an outward direction so that the scraper will be held yieldably in engagement with the interior surface of the drum. The brackets 20 are provided with laterally extending cams 23, said cams being arranged to be engaged by suitable contact members such as rollers 211, supported interiorly upon the headsv or ends of the drum, where said contact members are arranged in radial alinement with the cleats 7'; these contact members, as the drum rotates, will engage the cams 23, and will force the scraper' carrying brackets against the tension of the springs 22 in the direction of the axis of the drum, thus enabling the cleats to pass the `blade of the scraper withoutinterference or stoppage.

The operation and advantages of the improved device Will be readily understood from the foregoing description when taken 1n connection with the drawings hereto annexed. The dry material that is to be mixed 1s shoveled into the drum, in proper proportions, and the lid is then closed. The drum will then be rolled to the place where cement is to bc used, and While it is being thus transported water is gradually added to the con tents from the tank 10, the water supply being regulated by the valve 14. In this manner the water will be added slowly and gradually, and while the dry materials are in a state of agitation, which is aided by the cleats 7 and by the scraper', which latter keeps the interior surface of the drum free from adhering cement. `I/Vhen the dumping place is reached, the door is thrown open or detached, after which the contents may be readily discharged.v

Having thus fully described the invention, what is claimed as new is l. In a mixing machine, the combination of a drum mounted for revolution and having interior cleats, a scraper within the drum, supporting means for the scraper, said supporting means adapting the scraper to be moved toward and from the interior surface of the drum, a spring to move the scraper outwardly and engage the same with the inner surface of the drum between cleats, and means to intermittently move the scraper inwardly to cause the same to successively clear the cleats.

2. A mixing machine comprising a drum having interior cleats, a shaft extending axially through the drum, shaft means connected with the shaft, a radially movable scraper connected with and supported by the shaft, and means for moving the scraper toward and from the shaft to clear the cleats.

3. A mixing machine comprising a drum having interior cleats, a shaft extending axi- 'ally through the drum, draft means con' nectcd with the shaft, arms extending radially from the latter, spring actuated brackets slidably connected with the arms and having laterally extending cams, a scraper carried by the brackets, and cam engaging contact members supported interiorly upon the heads of the drum.

4. A mixing machine comprising a drum having interior cleats, a shaft extending radially through the drum, hubs secured adjustably upon the shaft and having radially extending arms, scraper carrying brackets having sockets slidably engaging the arms, springs coiled upon the'latter and engaging the brackets, cams extending laterally from the brackets, and cam engaging rollers upon the heads of the drum.

A mixing machine comprising a drum li O having interior cleats, a tubular shaft exlin presence of two witnesses.

AN SON RILEY I-IANNAFORD.

Witnesses: Y

Lo'r'rIE A. CLEVELAND, BEATRICE CLEVELAND. 

